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PC97338 Datasheet(PDF) 124 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # PC97338
Description  ACPI 1.0 and PC98/99 Compliant SuperI/O
PDF  221 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

PC97338 Datasheet(HTML) 124 Page - National Semiconductor (TI)

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TABLE 62. Parallel Port Reset States
4.2.1
Standard Parallel Port (SPP)
Modes Register Set
All SPP mode port operation is controlled by three
registers. Table 63 shows the registers of the parallel
port in the Standard Parallel Port (SPP) modes.
The register bits assignments are compatible with the
assignments in existing SPP devices.
TABLE 63. Standard Parallel Port Registers
4.2.2
SPP Mode Parallel Port Register
Bitmaps
4.2.3
Data Register (DTR), Offset 0
This bidirectional data port transfers 8-bit data in the
direction determined by bit 7 of configuration Register
PTR and bit 5 of SPP register CTR.
Bit 7 of the PTR selects the port mode - compatible
mode, with no data input capability, or extended
mode, having data input capability.
Bit 5 of the CTR determines the direction of the data
flow - whether from the Data register DTR to the sys-
tem, or from DTR to the external pins PD7-0.
Signal
Reset Control
State After Reset
SLIN
MR
TRI-STATE
INIT
MR
Zero
AFD
MR
TRI-STATE
STB
MR
TRI-STATE
IRQ5,7
MR
TRI-STATE
Offset A1
A0 Symbol Description
R/W
00
0
DTR
Data
R/W
10
1
STR
Status
R
2
1
0
CTR
Control
R/W
31
1
-
TRI-STATE
7
654
32
10
Reset
Required
0
0
0
0
0
0
0
0
Data Register
(DTR)
Offset 0
D2
D4
D5
D6
D7
D0
D1
D3
7
654
32
10
Reset
Required
1
1
1
1
1
1
1
1
Status Register
(STR)
Offset 1
IRQ Status
SLCT Status
PE Status
ACK Status
BUSY Status
Time-Out Status
Reserved
ERR Status
7
654
32
10
Reset
Required
0
0
0
0
0
0
1
1
Control Register
(CTR)
Offset 2
Printer Initialization Control(INIT)
Interrupt Enable
Direction Control
Reserved
Reserved
Data Strobe Control
Automatic Line Feed Control
Parallel Port Input Control



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